The next evolution in wireless networking holds promises of self-driving cars and movies that download in the blink of an eye. 5G is big at this year's Mobile World Congress, but don't expect it until 2020.

As we're bombarded with emails, tweets and status updates, it's easy to feel like slaves to the gadgets in our lives. The advantages of being connected are great, but you don't have to be trapped in the clutches of connectivity.